[SR-Users] sr-users Digest, Vol 81, Issue 7

Klaus Darilion klaus.mailinglists at pernau.at
Fri Feb 3 15:24:19 CET 2012



On 03.02.2012 12:06, Yufei Tao wrote:
> Hi
>
> I think I got the tcp_crlf_ping and the tcp_keepalive parameters mixed up.
>
> So for tcp_crlf_ping, Kamailio will only respond.

Yes.

 > While for
> tcp_keepalive parameters, if enabled on both server and client, both
> will be sending the keepalives, and the receiver will respond.

I have not tried it yet, but I think it is sufficiemt if only one side 
activates the keep-alive (a socket option). But of course only the party 
which set the keep-alive option on the socket is capable of detecting 
the connection loss.

> In order to use tcp_crlf_ping, client's app level rather than TCP level
> would have to send the crlfcrlf (pings) and process the crlf (pongs) in
> order to detect if Kamailio is up. Is this right?

Yes.

regards
Klaus

>
> Yufei
>
> On 03/02/12 11:00, sr-users-request at lists.sip-router.org wrote:
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>> Today's Topics:
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>>     1. TCP keepalive on server and client (Yufei Tao)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 3 Feb 2012 10:33:11 +0000
>> From: Yufei Tao<yufei.tao at redembedded.com>
>> Subject: [SR-Users] TCP keepalive on server and client
>> To:<sr-users at lists.sip-router.org>
>> Message-ID:<4F2BB7E7.2090601 at redembedded.com>
>> Content-Type: text/plain; charset="ISO-8859-1"
>>
>> Hi
>>
>> I want to use TCP keepalive to detect dead connections between Kamailio
>> and my SIP clients. I've got some questions about this:
>>
>> 1. If I enable it on Kamailio by setting for example:
>>
>> tcp_crlf_ping = yes
>> tcp_keepalive = yes
>> tcp_keepidle = 60
>> tcp_keepintvl = 10
>> tcp_keepcnt = 3
>>
>> > From what I read by gooling, that means Kamailio only responds to the
>> crlfcrlf sent by the client, but can't be configured to send the
>> crlfcrlf. Is this right?
>>
>> 2. On my client, if I use setsockopt to set the corresponding values:
>>
>>    SO_KEEPALIVE
>>    TCP_KEEPCNT
>>    TCP_KEEPIDLE
>>    TCP_KEEPINTVL
>>
>> would it make the client send crlfcrlf?
>>
>> The reason I'm confused is, with these settings, if Kamailio can only
>> respond to crlfcrlf, but not send, then would the client only respond
>> too, as in 1. and 2., they seem to configure the same set of parameters?
>> Please help me clarify this. Thanks very much!
>>
>> Yufei
>>
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>> Yufei Tao
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>
> --
> Yufei Tao
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